| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | only a [adj] period of [noun sg] | 9 |
|
| 2 | only a [adj] period [prep] [noun sg] | 9 |
|
| 3 | only a [adj] period of [noun sg] | 9 |
|
| 4 | only a [adj] period [prep] time | 6 |
|
| 5 | only a short period [prep] [noun sg] | 5 |
|
